Smithsonian Report, 1908. — Fessenden. 



Plate 3. 



Fig. 1.— Harmonic Interrupter for Determining Variation of Intensity 

 WITH Change of Note. 



Fig. 2.— Wireless Telephone Receiver, with Thin Copper 

 Diaphragm Repelled by Resistance Coil of 16 Ohms. 



Fig. 3.— Transformer Used in Transmitting Circuit. 



